net.sf.jaer.event
Class MotionOrientationEvent

java.lang.Object
  net.sf.jaer.event.BasicEvent
      net.sf.jaer.event.TypedEvent
          net.sf.jaer.event.PolarityEvent
              net.sf.jaer.event.OrientationEvent
                  net.sf.jaer.event.MotionOrientationEvent

All Implemented Interfaces:

EventInterface<BasicEvent>

public class MotionOrientationEvent
extends OrientationEvent

Represents an event with direction of motion and delay

Author:

tobi

Nested Class Summary

static class

MotionOrientationEvent.Dir represents a direction.

Nested classes/interfaces inherited from class net.sf.jaer.event.OrientationEvent

OrientationEvent.UnitVector

Nested classes/interfaces inherited from class net.sf.jaer.event.PolarityEvent

PolarityEvent.Polarity

Field Summary

short	delay the 'delay' value of this cell, an analog (but quantized) quantity that signals the time delay assoicated with this event.
MotionOrientationEvent.Dir	dir unit vector of direction of motion
byte	direction the direciton of motion, a quantized value indexing into Dir
byte	distance the distance associated with this motion event.
float	speed speed in pixels per second
static MotionOrientationEvent.Dir[]	unitDirs An array of 8 nearest-neighbor unitDirs going CCW from down (south) direction.
java.awt.geom.Point2D.Float	velocity stores computed velocity (DirectionSelectiveFilter computes it).

Fields inherited from class net.sf.jaer.event.OrientationEvent

hasOrientation, orientation, unitVectors

Fields inherited from class net.sf.jaer.event.PolarityEvent

polarity

Fields inherited from class net.sf.jaer.event.TypedEvent

type

Fields inherited from class net.sf.jaer.event.BasicEvent

timestamp, x, y

Constructor Summary

MotionOrientationEvent()
Creates a new instance of MotionOrientationEvent

Method Summary

static java.awt.geom.Point2D.Float	computeMotionVector(MotionOrientationEvent e)
static float	computeSpeedPPS(MotionOrientationEvent e)
void	copyFrom(BasicEvent src) copies fields from source event src to this event
int	getNumCellTypes() Returns the number of types this type of event has, e.g.
int	getType() Orientation type output takes values 0-3; 0 is a horizontal edge (0 deg), 1 is an edge tilted up and to right (rotated CCW 45 deg), 2 is a vertical edge (rotated 90 deg), 3 is tilted up and to left (rotated 135 deg from horizontal edge).
java.lang.String	toString()

Methods inherited from class net.sf.jaer.event.BasicEvent

getTimestamp, getX, getY, setTimestamp, setX, setY

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Field Detail

direction

public byte direction

the direciton of motion, a quantized value indexing into Dir

dir

public MotionOrientationEvent.Dir dir

unit vector of direction of motion

delay

public short delay

the 'delay' value of this cell, an analog (but quantized) quantity that signals the time delay assoicated with this event. Smaller time delays signal larger speed

distance

public byte distance

the distance associated with this motion event. This is the distance in pixels to the prior event that signaled this direction

speed

public float speed

speed in pixels per second

velocity

public java.awt.geom.Point2D.Float velocity

stores computed velocity (DirectionSelectiveFilter computes it). This vector points in the direction of motion and has units of pixels per second (PPS).

unitDirs

public static final MotionOrientationEvent.Dir[] unitDirs

An array of 8 nearest-neighbor unitDirs going CCW from down (south) direction.

these unitDirs are indexed by inputType, then by (inputType+4)%8 (opposite direction) when input type is orientation, then input type 0 is 0 deg horiz edge, so first index could be to down, second to up so list should start with down IMPORTANT, this order *depends* on DirectionSelectiveFilter order of orientations

Constructor Detail

MotionOrientationEvent

public MotionOrientationEvent()

Creates a new instance of MotionOrientationEvent

Method Detail

getType

public int getType()

Description copied from class: OrientationEvent

Orientation type output takes values 0-3; 0 is a horizontal edge (0 deg), 1 is an edge tilted up and to right (rotated CCW 45 deg), 2 is a vertical edge (rotated 90 deg), 3 is tilted up and to left (rotated 135 deg from horizontal edge).

Specified by:

getType in interface EventInterface<BasicEvent>

Overrides:

getType in class OrientationEvent

Returns:

the type

See Also:

OrientationEvent.hasOrientation

toString

public java.lang.String toString()

Overrides:

toString in class OrientationEvent

getNumCellTypes

public int getNumCellTypes()

Description copied from interface: EventInterface

Returns the number of types this type of event has, e.g. 2 for a PolarityEvent or 4 for an OrientationEvent

Specified by:

getNumCellTypes in interface EventInterface<BasicEvent>

Overrides:

getNumCellTypes in class OrientationEvent

Returns:

number of types

copyFrom

public void copyFrom(BasicEvent src)

copies fields from source event src to this event

Specified by:

copyFrom in interface EventInterface<BasicEvent>

Overrides:

copyFrom in class OrientationEvent

Parameters:

src - the event to copy from

computeSpeedPPS

public static float computeSpeedPPS(MotionOrientationEvent e)

computeMotionVector

public static java.awt.geom.Point2D.Float computeMotionVector(MotionOrientationEvent e)

Returns:

the newly-computed motion vector that uses the distance of the event and the delay. The speed is the distance divided by the delay and is in pixels per second.